[sdiy] stuck on TR-909 hats repair

[epk]

ag...that's what I was afraid of.

thanks,

epk

On Sep 26, 2009, at 2:37 AM, Colin f wrote:

>
>> In the circuit pre D/A, I've replaced all the IC's (except
>> for the rom), replaced all the transistors, and tested all
>> the caps, diodes, and resistors.  Aside from replacing the
>> rom I don't know what to do next.
>
> Next thing to do would be to try replacing the ROM.
> A tricky proposition, since the 909 ROMs are mask-programmed, and  
> use a
> non-JEDEC standard pinout.
> Two pins need swapped over, and IIRC the CE line is active high on  
> the hats
> rather than active low.
>
> Cheers,
> Colin f
>
>
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